Elevator Door Cable Integrity Detection via Signal Reproducibility
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Solution Overview
Problem
Conventional elevator door control systems face difficulties in reliably detecting a partially broken state of cables due to repeated bending deformation, leading to unstable current flow and poor conduction characteristics, which affects the accuracy of obstacle detection signals.
Innovation Solution
An elevator door control system that includes a door sensor, a door motor control unit, a transmission unit with a cable arranged along a link mechanism, a storage unit to associate binary signal changes with door positions, and a partially broken state determination unit that assesses reproducibility of door positions to determine cable integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cable is wired along the link mechanism and fixed at positions away from the joint portion, then the cable is easier to install and the link mechanism can move freely, but the cable is subjected to repeated bending stress near the joint portion leading to partial wire breakage
Solution Approach 1:
The patent applies preliminary action by fixing the cable to the link mechanism at the joint portion before operation begins. This preventive measure ensures that the cable is properly positioned and secured at the critical bending area from the start, preventing future wire breakage while maintaining ease of installation through a straightforward fixing process
2Reliability
If the cable is fixed to the link mechanism near the joint portion, then the cable is protected from bending stress and maintains stable conduction, but the installation becomes more complex and may interfere with link mechanism movement
Solution Approach 1:
The patent applies local quality by concentrating the cable fixation specifically at the joint portion of the link mechanism where bending stress occurs. This localized fixing approach provides targeted protection to the critical area without requiring complex fixation throughout the entire cable path, thus maintaining conduction stability while avoiding excessive complexity
3Adaptability or versatility
If the cable is not fixed near the joint portion of the link mechanism, then the link mechanism can extend and bend freely during door operation, but the cable experiences repeated bending deformation causing wire breakage
Solution Approach 1:
The patent applies preliminary action by pre-fixing the cable at the joint portion before the link mechanism undergoes repeated extension and bending operations. This advance securing ensures the cable maintains its position and avoids excessive bending deformation during normal operation, preserving wire integrity while allowing the link mechanism to move freely
Data Source
AI summary
An elevator door control system comprises a door sensor, a door motor control unit, a transmission unit being wired by a cable as part of or all of a transmission path between the door sensor and the door motor control unit, a storage unit to store a change in a binary signal indicating detection of an obstacle in association with a door position at a time of the change in the binary signal. A partially broken state of the cable is determined by evaluating reproducibility of the door position at the time of the change in the binary signal on the basis of the timing of the change in the binary signal and a door position at the time of the change in the binary signal. The partially broken state of the cable caused by repeated bending deformation of the cable can be determined.